diff --git a/docs/source/releasenotes/index.rst b/docs/source/releasenotes/index.rst
index 6424aebbe..e00b199f8 100644
--- a/docs/source/releasenotes/index.rst
+++ b/docs/source/releasenotes/index.rst
@@ -10,6 +10,7 @@ bugs fixed, and known issues for each successive release.
 .. toctree::
     :maxdepth: 1
 
+    notes_0.5.0
     notes_0.4.4
     notes_0.4.3
     notes_0.4.2
diff --git a/docs/source/releasenotes/notes_0.5.0.rst b/docs/source/releasenotes/notes_0.5.0.rst
index fd01037fc..58bd0970a 100644
--- a/docs/source/releasenotes/notes_0.5.0.rst
+++ b/docs/source/releasenotes/notes_0.5.0.rst
@@ -4,6 +4,10 @@
 Release Notes for OpenMC 0.5.0
 ==============================
 
+.. note::
+   These release notes are for an upcoming release of OpenMC and are still
+   subject to change.
+
 -------------------
 System Requirements
 -------------------
@@ -19,7 +23,7 @@ New Features
 
 - Added 'events' score that returns number of events that scored to a tally.
 - Restructured tally filter implementation and user input.
-- Source convergence acceleration via CMFD (implemented with PETSC).
+- Source convergence acceleration via CMFD (implemented with PETSc).
 - Ability to read source files in parallel when number of particles is greater
   than that number of source sites.
 - Cone surface types.
@@ -28,9 +32,11 @@ New Features
 Bug Fixes
 ---------
 
+- c0e3ec_: Prevent underflow when compiling with MPI=yes and DEBUG=yes.
 - 6f8d9d_: Set default tally labels.
 - 6a3a5e_: Fix problem with corner-crossing in lattices.
 
+.. _c0e3ec: https://github.com/mit-crpg/openmc/commit/c0e3ec
 .. _6f8d9d: https://github.com/mit-crpg/openmc/commit/6f8d9d
 .. _6a3a5e: https://github.com/mit-crpg/openmc/commit/6a3a5e